Technology, Data & Cybersecurity
C5 Alliance
Guernsey and Jersey technology consultancy, among the largest providers across the Channel Islands.
Described as the largest provider of technology solutions across the Channel Islands, C5 Alliance is a Guernsey/Jersey technology and advisory firm of 160+ IT experts. Offers managed IT, cyber security, cloud and strategic/AI advisory, aligned to ISO 27001, PCI/DSS and GDPR. Appointed to provide the States of Guernsey IT helpdesk under the government's multi-vendor model from August 2025.
Some fields in this record are not yet source-confirmed.
Jurisdiction
Guernsey
Service line
Technology, Data & Cybersecurity
Head office
St Peter Port, Guernsey
Size
Mid (50-250 staff)
Services
Managed IT services (24x7x365), Cyber security, Cloud migration, Strategic & digital advisory, AI & data solutions
Jurisdictions served
Guernsey, Jersey
Client types
Regulated financial services, Public sector, Enterprise
Also listed in
Opens the firm’s own site in a new tab.
More technology, data & cybersecurity in Guernsey
Resolution IT
Managed IT and cyber security for regulated firms; 80+ staff across Guernsey, Jersey and Dubai.
Logicalis Guernsey
Guernsey IT services with a 37-year pedigree; among the largest in the Channel Islands.
Prosperity 24/7
Channel Islands business and technology consultancy established 2011; St Helier HQ, Guernsey office.
Sure (by Beyon)
Guernsey-headquartered telecoms and technology serving Guernsey, Jersey, the Isle of Man and beyond.
Clarity
ISO 27001, Cyber Essentials Plus and IASME-certified IT partner supporting DORA compliance, spanning managed IT, cybersecurity, cloud and AI.
Cortex
Software and data company behind Bragi, a data automation platform with tools for FATCA and CRS regulatory tax reporting and static data management.
All technology, data & cybersecurity in GuernseyReceive The Alternative Investor each month, with news and features from across private capital.
Subscribe